Ultrafast vibrational dynamics and solvation complexes of methyl acetate in methanol studied by sub‐picosecond infrared spectroscopy

Abstract

The vibrational dynamics of the CO stretching mode of methyl acetate (MA) in methanol was studied by time-resolved infrared (IR) pump-probe spectroscopy. The vibrational energy relaxation (VER) process includes two components with time constants of 1.3 ± 0.1 and 4.0 ± 0.2 ps. These components result from the vibrational excitations of the hydrogen-bonding complex of MA with one methanol and the MA monomer, respectively. The difference in the VER time is explained by the increase of the vibrational density of states (VDOS) by the intermolecular hydrogen bond. The time constants and the decayassociated spectra are almost identical between the CH 3 OH and the CH 3 OD solutions. The vibrational modes localized in the intramolecular OH/OD bond of the solvent methanol have little effect on the vibrational dynamics of MA.

Kinetics of Exchange between Zero-, One-, and Two-Hydrogen-Bonded States of Methyl and Ethyl Acetate in Methanol

“…In addition, the anharmonicity values obtained from these 2D IR results (Table 1) are consistent with previous studies. 33, 39, 42 …”

Editorial

“…These include: a study on polarization-sensitive CARS spectroscopy of free-base porphyrins; [1] a study on the ultrafast bimolecular radical reaction between S 1 p-terphenyl and carbon tetrachloride; [2] a time-resolved resonance Raman and density functional theory study of the deprotonation reaction of the triplet state of para-hydroxybenzophenone in mixed acetonitrile/water solutions; [3] an investigation of femtosecond Raman-induced Kerr effect spectroscopy; [4] a paper on ultrafast vibrational dynamics and solvation complexes of methyl acetate in methanol studied by sub-picosecond infrared spectroscopy; [5] an ultrafast dynamics and photochemistry study of π − π * excited trans-azobenzene; [6] a paper on ultrafast dynamics in Cu(I)bisdiimine complexes from resonance Raman intensities; [7] a three-state model for femtosecond broadband stimulated Raman scattering; [8] a picosecond time-resolved ultraviolet resonance Raman study on photoinduced electron transfer in glucose oxidase; [9] a study on molecular vibrational imaging of a human cell by multiplex coherent anti-Stokes Raman scattering microspectroscopy using a supercontinuum light source; [10] a paper on characteristic wavenumber shifts of the stimulated Raman scattering from interfacial water molecules induced by laser-induced plasma generation at air-water and water-silver interfaces; [11] a study on the identification of chemical species of fluorescein isothiocyanate isomer-I (FITC) monolayers on platinum by doubly resonant sum-frequency generation spectroscopy; [12] a work on coherent acoustic phonons in a thin gold film probed by femtosecond surface plasmon resonance; [13] a review of recent advances in linear and nonlinear Raman spectroscopy; [14] an investigation of the halide-ion-assisted increase of surfaceenhanced hyper-Raman scattering; [15] and finally a study on ultrafast Raman loss spectroscopy [16] . …”

Recent advances in linear and non‐linear Raman spectroscopy. Part III

“…With the same technique and employing ultraviolet resonance Raman excitation, Fujiwara and Mizutani [90] investigated the photoinduced electron transfer in glucose oxidase. Finally, the ultrafast vibrational dynamics and the solvation complexes of methyl acetate in methanol have been studied by sub-picosecond infrared spectroscopy as reported in Banno et al [91] Biosciences (Biomolecules, Cells, Bacteria,…”